Arm Notes

Muscles of the Forearm

• Extensor Digitorum: Extends fingers/wrist, abducts fingers; located on the posterior forearm.

• Extensor Carpi Radialis Longus: Extends/abducts wrist; located on the lateral forearm.

• Brachialis: Flexes forearm at elbow; located beneath biceps brachii in upper arm.

• Abductor Pollicis Longus: Abducts/extends thumb; located in forearm extending to the thumb.

• Triceps Brachii: Main elbow extensor; located on the back of upper arm.

• Coracobrachialis: Flexes/adducts humerus; located in the upper arm from scapula.

• Brachioradialis: Stabilizes elbow, aids in forearm movement; located in the forearm.

• Palmaris Longus: Weak wrist/elbow flexor, tenses palm skin; located on anterior forearm.

• Pronator Quadratus: Prime mover for forearm rotation; located distally between radius and ulna.

• Extensor Carpi Radialis Brevis: Extends/abducts wrist; located in forearm.

• Flexor Digitorum Profundus: Flexes fingers/wrist; located in deeper forearm layer.

• Flexor Digitorum Superficialis: Flexes wrist/middle phalanges; located above profundus in forearm.

• Extensor Pollicis Longus: Extends thumb; located in forearm.

• Extensor Pollicis Brevis: Extends distal phalanx of thumb; located extending toward thumb in forearm.

• Flexor Carpi Ulnaris: Powerful wrist flexor/adductor; stabilizes wrist during finger extension.

• Flexor Pollicis Longus: Flexes distal phalanx of thumb; located in forearm extending to thumb.

• Flexor Carpi Radialis: Powerful wrist flexor/abductor; located on anterior forearm.

• Extensor Carpi Ulnaris: Extends/abducts wrist; located on posterior forearm.

• Supinator: Aids in forearm supination; located around elbow.

• Pronator Teres: Weak elbow flexor, pronates forearm; located near the elbow in forearm.

• Biceps Brachii: Flexes elbow and lifts forearm; located on anterior upper arm.